Mechanical time-fuse



U. WILC'K.

MECHANICAL TIME FUSE.

APPLICATION FILED SEPT. 7. 1920.

Patented Dec. 14,1920.

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men. TIHE'FUSE. I i i N Specification of Letters latent.

.Application filed se tember a ezo, Serial No. 408,744.

To all whom it concern Be it known that IIJLRIGH Win-ox, re-

.siding at Essen-Rellinghausen, Germany, a

- citizen of the German Republic,- have in-' vented a certain new anduseful Improve- --ment in Mechanical Time-Fuses, of which the followingis aspecification. v .-My invention refers tomechanical time fusescontaining. a clockwork disposed Within an annular, adjustable casing.Theparticula'r characteristic feature. of the fuse consists in an armcoupled with anarbor of the clockwork such that the arm is permitted toaxially shift on the arbor. The.- further characteristic feature of thisarm 4 construction consists in means by which after the projectile isfired, the .arm is thrown, by means of a spring against an annularretaining member provided on said -adjustablecasing. Iti's theparticular purpose of this invention to insure the operation of this armso that the fuse will set offthe charge at-the time desired.

.In the accompanying drawings, an example of the invention isillustrated. In these drawings a Figure 1. shows an axial, longitudinalsection through the fuse and r Fig. 2 shows a section on the line 2-2 inFig. l seen from the top'. 7

Referring to the .drawings, A represents the main fuse body to which issuitably attached, by means of screws running in an annular groove ofthe body A, the annular adjustable casing B,which surrounds theclockwork. C is the main arbor of the clockwork which is hollow andwhich is erated by the clock spring D.' An-arm 1 is coupled with'arbor Cso that it may shift thereon in axial direction, this-arm extending inopposite radial directions. The portion e of the. arm located at theright of arbor C (see Fig. 2) is broader and shorter than the oppositeend e of the arm. The

arm is spring-controlled by means of a spring F located in the hollowarbor which spring tends to throw the arm toward the point of theprojectile. Normally, this arm is prevented from moving axially on arborC in well known manner by means of a lever G which is thrown out ofengagement with the arm when the projectile is fired and which whenlocln'ng the arm, at the same time prevents rotation of arbor C bg clockspring D. The adjustable casing .the time fuse.

is provided at its upper portiodwitlr-an inwardly extending annular'Bwhich carries an annular retaining member b "extendmg 1n a, plane inparallel to-the plane 1n which the arm rotates, andfwhich'is disposedclosely adjacent 'thereto.; The member 12 is of suflicient width in:radial direction-that both ends e and e of arm E bear against it whenthe arm is shifted'u wardly under the influence ofs'pring .F.hei"central portion of member 6 is cutout such that it 'willpermit thearm, when in proper jalin'ement with this cut outportion, to passthrough the retaining member.

As "will be seen 1n Fig. 2, portion 6 permits arm portion e to pass, andcut out portion 6 permits arm portion e to pass. At the outer end of thecut out port on. bal'so the cylindrical portion B is cut away as shownat 12 The general construction of ''the' clockwork and fuse mechanism issimilar to those ,known in the art and its operation; is suchthat whenarm E is rotated into such position that it properly registers withthecut out portion' b it will be thrown u wardly under the' influence ofspring F,

which sets the fuse mechanism into action.

When the projectile fired, lever G is disengaged inwell known mannerfrom arm E.

so that arbor C is permitted to rotate under the influence of its clockspring D whereby at the same time arm E is thrown against the retainingmember, 6 and commences to rotate with the arbor. This slight axialmovement ofarm E against retaining member 72 is at first not sulficientto setloif the percussion cap. However, owing to the shape of theretaining member 6 described above, bothends e and e of arm Ebearagainst theretainin'g, member so that the arm is subject to uniformpressure at both of i s ends which prevents jamming ofthe arbor andinsures the smooth of the clockwork and thus certain operation of g .E.moves axially far: ther only whenthe clockwork has rotated arbor Csufficiently to bring thearm' into register with the correspondinglyshaped portions b", b of retaining mem-;

cut out her If. i

'As soon as the arm- E, whichis rotated the clockwork" in the directionof ,the arrow -Y (see Fig. '2) has arrived under the'cut out portion b",b, it enters this cutout por tion under the pressure of sprmg F. :FAtthesame time the annular projection g on the arm E slides of? of theprojection 2" on the lever J so that this latter swings outward underthe action of centrifugal force. I This movement causes rotation of thespindle J At the same time shoulder 2' slides oii the collar It" of thefiring bolt K and the firing bolt penetrates the primer under the actionof the spring If. The time at which the perforation of the primer takesplace is, as will be seen from What has been stated above. dependentupon the adjustment which has been imparted to the adjustable casing Iand consequently the annular retaining member 5 To prevent theadjustment imparted to the adjustable casing from being lost when theshot is fired an arrangement is provided in the Well-known Way, by whichthe member 13 is 'immovably secured to the body A of the fuse by actionof the discharge, when the gun is fired.

Adj ustment-between the casing 13 and base A is provided for by screwspassing through the casing B. These screws carry pro ections whichengage an annular recess in the base A.

I claim- 1. Mechanical time fuse of the character described having aclockwork for controlling the operation of the fuse mechanism, anadjustable casing surrounding said'clockwork, an arm coupled atitscenter With-an arbor of said clockwork and having. free- (10111 ofmovement on saidarbor in axial direction thereof, a spring suitablydisposed and tending to axially move said arm on said arbor in a givendirection, a retaining member on said casmg'adapted to contact with bothends of said arm and tending to normally prevent such axial movement ofsaid arm, said retaining member having a. central cutaway portion topermit axial movement of the arm when the latter is rotated to registerwith said out awayportion. 45

2. Mechanical time fuse of the character described having a clockworkfor control ling the operation of the fuse mechanism, an adjustablecasing surrounding said clock work, an arm mounted u" on an arbor ofsaid clockwork, 'said arm eirrg capable of axial movement in onedirection, means nor.-

mally tending to axially move the arm on said arbor, a retaining memberon said casing adapted to contact with said arm. at both ends thereof tonormally prevent axial movement of the arm, said retainin memher havinga cutaway part permitting-the axial movementof the; arm when the latteris rotated to register wlth-the cut away portion.

The oregoing specification si ned at Essen, Germany, this 18th da of Ly, 1920.

In presence if- Hans Gorrsmnn, Josnr *Onsnnrz.

ULRI H WILCK.-

